I agree, and I'll add this: it's not just about the inability of Purvis and Lewis to replace Brown. The loss of Brown would also greatly affect their depth. With Brown, Purvis, and Lewis, the Pack have the flexibility to always have 2 strong ballhandlers on the court. Those 3 can rotate for basically all 80 minutes. That leaves Wood and Warren free to play completely off ball (with Warren perhaps also playing a bit at the PF spot in small lineups). If Brown is out, the Pack would have only one backup on the perimeter and only two guys on the team capable of handling the ball with any competence. That would be a critical loss. They'd go from a front-runner in the ACC and top-10-caliber team to probably a bit worse than last year (similar depth issues, much less experience in the backcourt, less versatility).
But from what I've heard from my State friends, it's not considered a major concern at this point. Just a bump in the summer road. It will be interesting to keep an eye on, but until we hear differently I'd not expect this to end up being a big deal.